Now,I give some code ,as follows :
protected void Button1_Click(object sender, EventArgs e)
{
int count = 0;
string items = "";
foreach (GridViewRow item in GridView1.Rows)
{
CheckBox cb = (CheckBox)item.FindControl("CheckBox2");
if (cb.Checked)
{
items = items + item.Cells[1].Text;
count++;
}
}
Response.Write(count.ToString() + items);
}